Alert archive / U.S. Virgin Islands
Weather alerts in U.S. Virgin Islands, 2019
75 weather alerts in 2019, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered any part of the state, so the counties below add up to more than the state.
- Alerts
- 75
- Warnings
- 11
- Watches
- 6
- Advisories
- 30
- Busiest month
- August13 alerts
- Busiest day
- August 28, 20196 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
0 of 1 tornado reports fell inside a warning.
U.S. Virgin Islands, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 1 | 0% | |||
| Severe thunderstorm warnings | 0 | 0 | ||||
| Flash flood warnings | 5 | 2 | 60% | 2 | 100% | 13 min |
Each office's whole area, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS JSJ: tornado warnings | 0 | 3 | 0% | |||
| NWS JSJ: severe thunderstorm warnings | 0 | 3 | 0% | |||
| NWS JSJ: flash flood warnings | 37 | 17 | 54% | 81 | 62% | 46 min |
An office's figures cover every county it serves, including across state lines.
Verified by the Iowa Environmental Mesonet's Cow, which matches each storm-based warning with the local storm reports inside its polygon while it was in force, within 15 km of its edge: a tornado warning counts as verified on a tornado report, a severe thunderstorm warning on hail of 1 inch or more, a gust of 58 mph or more, or wind damage, a flash flood warning on a flash flood report. The false alarm ratio is the share of warnings with no such report; "inside a warning" is the probability of detection, the share of reports that fell inside one; lead time runs from the warning's issue to each report inside it, counting zero for a report that came first. A warning with no report is not proof nothing happened: reports come from spotters, the public and damage surveys, and are thin where few people live.
The alerts
Every alert, in the order issued. Times are local, Central Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 9, 2:51 AM CST | Rip Current Statement | JSJ | 37 hr | |
| Jan 12, 2:16 AM CST | Rip Current Statement | JSJ | 48 hr | |
| Jan 22, 2:45 AM CST | Rip Current Statement | JSJ | 5 days | |
| Jan 22, 8:29 AM CST | Rip Current Statement | JSJ | 4 days | |
| Jan 23, 2:11 AM CST | High Surf Advisory | JSJ | 50 hr | |
| Jan 26, 2:15 PM CST | Rip Current Statement | JSJ | 14 hr | |
| Jan 30, 1:32 PM CST | Rip Current Statement | JSJ | 37 hr | |
| Feb 10, 1:59 PM CST | Rip Current Statement | JSJ | 3 days | |
| Feb 20, 3:27 PM CST | Rip Current Statement | JSJ | 4 days | |
| Feb 24, 7:51 PM CST | Rip Current Statement | JSJ | 6 days | |
| Apr 3, 2:58 PM CDT | Rip Current Statement | JSJ | 4 days | |
| Apr 22, 5:10 PM CDT | Rip Current Statement | JSJ | 60 hr | |
| Apr 30, 3:12 AM CDT | Rip Current Statement | JSJ | 60 hr | |
| May 1, 6:38 PM CDT | Areal Flood Advisory | JSJ | 2 hr | |
| May 1, 7:55 PM CDT | Flash Flood Warning | JSJ | 3 hr | |
| May 1, 11:03 PM CDT | Areal Flood Warning | JSJ | 5 hr | |
| May 11, 2:41 PM CDT | Rip Current Statement | JSJ | 4 days | |
| May 23, 11:18 PM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| May 24, 2:14 AM CDT | Areal Flood Advisory | JSJ | 2 hr | |
| May 27, 3:05 AM CDT | Rip Current Statement | JSJ | 48 hr | |
| May 27, 8:37 AM CDT | Areal Flood Advisory | JSJ | 113 min | |
| May 28, 9:45 AM CDT | Flash Flood Watch | JSJ | 3 days | |
| May 29, 6:00 AM CDT | Areal Flood Advisory | JSJ | 5 hr | |
| Jun 6, 4:09 AM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Jun 6, 7:16 AM CDT | Areal Flood Advisory | JSJ | 93 min | |
| Jun 25, 12:32 AM CDT | Areal Flood Advisory | JSJ | 58 min | |
| Jul 4, 3:36 PM CDT | Rip Current Statement | JSJ | 37 hr | |
| Jul 28, 2:53 PM CDT | Flash Flood Watch | JSJ | 3 days | |
| Jul 31, 2:53 PM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Jul 31, 4:10 PM CDT | Flash Flood Warning | JSJ | 2 hr | |
| Aug 2, 3:25 PM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Aug 27, 4:31 AM CDT | Hurricane Watch | JSJ | 39 hr | |
| Aug 27, 4:31 AM CDT | Tropical Storm Warning | JSJ | 39 hr | |
| Aug 27, 12:52 PM CDT | Flash Flood Watch | JSJ | 52 hr | |
| Aug 27, 4:49 PM CDT | Rip Current Statement | JSJ | 4 hr | |
| Aug 27, 8:54 PM CDT | Coastal Flood Warning | JSJ | 22 hr | |
| Aug 27, 8:54 PM CDT | High Surf Warning | JSJ | 22 hr | |
| Aug 28, 7:05 AM CDT | Flash Flood Warning | JSJ | 4 hr | |
| Aug 28, 9:30 AM CDT | Flash Flood Warning | JSJ | 9 hr | |
| Aug 28, 10:11 AM CDT | Hurricane Warning | JSJ | 15 hr | |
| Aug 28, 3:18 PM CDT | Flash Flood Warning | JSJ | 3 hr | |
| Aug 29, 5:35 PM CDT | Areal Flood Advisory | JSJ | 3 hr | |
| Aug 29, 6:24 PM CDT | Areal Flood Advisory | JSJ | 117 min | |
| Sep 16, 3:25 AM CDT | Rip Current Statement | JSJ | 7 days | |
| Sep 18, 7:48 PM CDT | High Surf Advisory | JSJ | 3 days | |
| Sep 22, 9:45 AM CDT | Tropical Storm Watch | JSJ | 18 hr | |
| Sep 23, 2:34 AM CDT | Flash Flood Watch | JSJ | 62 hr | |
| Sep 23, 4:12 AM CDT | Tropical Storm Warning | JSJ | 48 hr | |
| Sep 30, 2:57 AM CDT | Rip Current Statement | JSJ | 4 days | |
| Oct 5, 9:48 AM CDT | Areal Flood Advisory | JSJ | 87 min | |
| Oct 7, 2:42 AM CDT | Rip Current Statement | JSJ | 4 days | |
| Oct 7, 2:42 AM CDT | Rip Current Statement | JSJ | 8 days | |
| Oct 11, 11:26 AM CDT | Areal Flood Advisory | JSJ | 78 min | |
| Oct 15, 11:07 AM CDT | Areal Flood Advisory | JSJ | 113 min | |
| Oct 17, 12:00 PM CDT | Areal Flood Advisory | JSJ | 2 hr | |
| Oct 18, 10:17 AM CDT | Areal Flood Advisory | JSJ | 118 min | |
| Oct 18, 12:18 PM CDT | Areal Flood Advisory | JSJ | 57 min | |
| Oct 18, 1:21 PM CDT | Areal Flood Advisory | JSJ | 90 min | |
| Oct 26, 3:26 PM CDT | Rip Current Statement | JSJ | 11 days | |
| Oct 27, 8:19 AM CDT | High Surf Advisory | JSJ | 7 days | |
| Oct 31, 3:05 AM CDT | Coastal Flood Advisory | JSJ | 62 hr | |
| Nov 1, 3:19 AM CDT | Coastal Flood Advisory | JSJ | 50 hr | |
| Nov 2, 11:41 AM CDT | Areal Flood Advisory | JSJ | 2 hr | |
| Nov 3, 9:45 AM CST | Areal Flood Advisory | JSJ | 3 hr | |
| Nov 3, 10:57 AM CST | Areal Flood Advisory | JSJ | 3 hr | |
| Nov 10, 1:39 AM CST | Rip Current Statement | JSJ | 3 days | |
| Nov 14, 2:10 AM CST | Rip Current Statement | JSJ | 62 hr | |
| Nov 20, 2:08 PM CST | Rip Current Statement | JSJ | 5 days | |
| Nov 29, 2:36 PM CST | Rip Current Statement | JSJ | 5 days | |
| Nov 29, 7:01 PM CST | High Surf Advisory | JSJ | 69 hr | |
| Nov 30, 6:30 PM CST | Coastal Flood Advisory | JSJ | 39 hr | |
| Dec 10, 3:01 AM CST | Rip Current Statement | JSJ | 9 days | |
| Dec 20, 8:19 AM CST | Rip Current Statement | JSJ | 12 days | |
| Dec 26, 11:56 AM CST | Areal Flood Advisory | JSJ | 3 hr | |
| Dec 26, 3:47 PM CST | Rip Current Statement | JSJ | 6 days |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20182020
Sources
National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.